Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Calendar.ViewModels/AccountManagementViewModel.cs

@@ -0,0 +1,37 @@
+using System.Threading.Tasks;
+using Wino.Core.Domain.Interfaces;
+using Wino.Core.Domain.Models.Navigation;
+using Wino.Core.Domain.Models.Store;
+using Wino.Core.ViewModels;
+
+namespace Wino.Calendar.ViewModels
+{
+    public partial class AccountManagementViewModel : AccountManagementPageViewModelBase
+    {
+        public AccountManagementViewModel(ICalendarDialogService dialogService,
+                                          IWinoServerConnectionManager winoServerConnectionManager,
+                                          INavigationService navigationService,
+                                          IAccountService accountService,
+                                          IProviderService providerService,
+                                          IStoreManagementService storeManagementService,
+                                          IAuthenticationProvider authenticationProvider,
+                                          IPreferencesService preferencesService) : base(dialogService, winoServerConnectionManager, navigationService, accountService, providerService, storeManagementService, authenticationProvider, preferencesService)
+        {
+            CalendarDialogService = dialogService;
+        }
+
+        public ICalendarDialogService CalendarDialogService { get; }
+
+        public override Task InitializeAccountsAsync()
+        {
+            return Task.CompletedTask;
+        }
+
+        public override async void OnNavigatedTo(NavigationMode mode, object parameters)
+        {
+            base.OnNavigatedTo(mode, parameters);
+
+            var t = await StoreManagementService.HasProductAsync(StoreProductType.UnlimitedAccounts);
+        }
+    }
+}